Sensibly equivalent¶ to:
CV133 CV852 EC90 L77 V741
The 6C4 triode valve was specified as both an amplifier and an RF power valve. In the latter role it would deliver 5.5 Watts in class C operation. With a very small envelope volume, this would make it ideal for hand portable equipment. In larger apparatus it could deliver enough drive power for much larger PA's.
The 6C4 electrodes when put into pairs in the same envelope become the 12AU7.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Datasheet & 1040.
Absolute Maximum Operating Conditions¶
Updated January 26, 2013. shape:thin.glass.tube construction:all.glass type:triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.a pin:2.k pin:3.h pin:4.h pin:5.a pin:6.g1 pin:7.k